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/****************************************************************
* Licensed to the Apache Software Foundation (ASF) under one *
* or more contributor license agreements. See the NOTICE file *
* distributed with this work for additional information *
* regarding copyright ownership. The ASF licenses this file *
* to you under the Apache License, Version 2.0 (the *
* "License"); you may not use this file except in compliance *
* with the License. You may obtain a copy of the License at *
* *
* http://www.apache.org/licenses/LICENSE-2.0 *
* *
* Unless required by applicable law or agreed to in writing, *
* software distributed under the License is distributed on an *
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY *
* KIND, either express or implied. See the License for the *
* specific language governing permissions and limitations *
* under the License. *
****************************************************************/
package org.apache.james.mime4j;
import java.io.InputStream;
import java.io.IOException;
/**
* InputStream that shields its underlying input stream from
* being closed.
*
*
* @version $Id: CloseShieldInputStream.java,v 1.2 2004/10/02 12:41:10 ntherning Exp $
*/
public class CloseShieldInputStream extends InputStream {
/**
* Underlying InputStream
*/
private InputStream is;
public CloseShieldInputStream(InputStream is) {
this.is = is;
}
public InputStream getUnderlyingStream() {
return is;
}
/**
* @see java.io.InputStream#read()
*/
public int read() throws IOException {
checkIfClosed();
return is.read();
}
/**
* @see java.io.InputStream#available()
*/
public int available() throws IOException {
checkIfClosed();
return is.available();
}
/**
* Set the underlying InputStream to null
*/
public void close() throws IOException {
is = null;
}
/**
* @see java.io.FilterInputStream#reset()
*/
public synchronized void reset() throws IOException {
checkIfClosed();
is.reset();
}
/**
* @see java.io.FilterInputStream#markSupported()
*/
public boolean markSupported() {
if (is == null)
return false;
return is.markSupported();
}
/**
* @see java.io.FilterInputStream#mark(int)
*/
public synchronized void mark(int readlimit) {
if (is != null)
is.mark(readlimit);
}
/**
* @see java.io.FilterInputStream#skip(long)
*/
public long skip(long n) throws IOException {
checkIfClosed();
return is.skip(n);
}
/**
* @see java.io.FilterInputStream#read(byte[])
*/
public int read(byte b[]) throws IOException {
checkIfClosed();
return is.read(b);
}
/**
* @see java.io.FilterInputStream#read(byte[], int, int)
*/
public int read(byte b[], int off, int len) throws IOException {
checkIfClosed();
return is.read(b, off, len);
}
/**
* Check if the underlying InputStream is null. If so throw an Exception
*
* @throws IOException if the underlying InputStream is null
*/
private void checkIfClosed() throws IOException {
if (is == null)
throw new IOException("Stream is closed");
}
}
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